RS-449

Also known as the EIA/TIA-449, the RS-449 is short for Recommended Standardard-449 and is a data standard that specifies the functional and mechanical characteristics of the interconnection between DTE and complying EIA electronic standards RS-422 and RS-423. The RS-449 standard is commonly found in data network communication equipment. Below is a layout of the 37-pin configuration for the RS-449, starting with pin 1 that is generally located at the top left of the connector.

Pin	Signal	Source
1	Shield	Common
2	Signal rate indicator	DTE
3	Unassigned	Unassigned
4	Send data	DTE
5	Send timing	DCE
6	Received data	DCE
7	Request to send	DTE
8	Receive timing	DCE
9	Clear to send	DCE
10	Local loopback	DTE
11	Data mode	DCE
12	Terminal ready	DTE
13	Receiver ready	DCE
14	Remote loopback	DTE
15	Incoming call	DCE
16	Select frequency	DTE
17	Terminal timing	DTE
18	Test mode	DCE
19	Signal ground	Common
20	Receive common	Common
21	Unassigned	Unassigned
22	Send data	Return
23	Send timing	Return
24	Receive data	Return
25	Request to send	Return
26	Receive timing	Return
27	Clear to send	Return
28	Terminal in service	DTE
29	Data mode	Return
30	Terminal ready	Return
31	Receiver ready	Return
32	Select standby	DTE
33	Signal quality	DCE
34	New signal	DTE
35	Terminal timing	Return
36	Standby indicator	DCE
37	Send common	Common

Also see: DTE, RS-232, RS-422, RS-423, RS-485

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Related Pages:
R - Definitions

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